Entering Date in dd-MM-yyyy format using numeric keyboard in UITextField swift 3.0

Question

I want to format(dd-MM-yyyy) the text while entering in UITextField, I am using swift 3.0, Any suggestion how can I implement the the same.

Answer 1

use like

// create one textfield
@IBOutlet var txtDOB: UITextField!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // set delegate for your textfield
    txtDOB.delegate = self

}

// call your function in textfield delegate shouldChangeCharactersIn

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    //Format Date of Birth dd-MM-yyyy

    //initially identify your textfield

    if textField == txtDOB {

        // check the chars length dd -->2 at the same time calculate the dd-MM --> 5
        if (txtDOB?.text?.characters.count == 2) || (txtDOB?.text?.characters.count == 5) {
            //Handle backspace being pressed
            if !(string == "") {
                // append the text
                txtDOB?.text = (txtDOB?.text)! + "-"
            }
        }
        // check the condition not exceed 9 chars
        return !(textField.text!.characters.count > 9 && (string.characters.count ) > range.length)
    }
    else {
        return true
    }
}

ObjectiveC

  - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
  {
//Format Date of Birth dd-MM-yyyy

 if(textField == txtDOB)
    {
    if ((txtDOB.text.length == 2)||(txtDOB.text.length == 5))
        //Handle backspace being pressed
        if (![string isEqualToString:@""])
            txtDOB.text = [txtDOB.text stringByAppendingString:@"-"];
    return !([textField.text length]>9 && [string length] > range.length);
}
else
    return YES;

}

Answer 2

Updated for Swift 5

if textField == dateTextField {
            if dateTextField.text?.count == 2 || dateTextField.text?.count == 5 {
                //Handle backspace being pressed
                if !(string == "") {
                    // append the text
                    dateTextField.text = dateTextField.text! + "."
                }
            }
            // check the condition not exceed 9 chars
            return !(textField.text!.count > 9 && (string.count ) > range.length)
        } else {
            return true
        }